Features SureHookï¿½ technology with revolutionary built in tension springs. Rods and hooks are stronger and sturdier with less bending. Folders stay on rails and slide with ease. Preprinted indexed A-Z tabs in assorted positions. Rip-proof tape reinforced gusset tops. Includes 10 self-adhesive blank labels. Hanging File Folder Type: Classification; Size: Letter; Expansion: 3 1/2"; Material(s): N/A.